OnSelect function on textbox

<textarea rows="3" cols="15">
Sample text,Sample text,Sample text,Sample text,Sample text,Sample text
</textarea>

now my question is how can I add the onselect function.I want the user to be able to select once on the text to copy and paste, not have to select the text manually.

<textarea rows="2" cols="20" on-click="this.focus();this.select()">

Although this will work too:

Code:

<textarea rows="2" cols="20" on-click="this.select()">